[BwanaNdege]

One Calorie is about 4,000 BTU.
One calorie is about 4 BTU

The folks at parties might know that one pound of fat equals about 3,500 Calories!

(did I get my decimals correct?)

[Blood of Tyrants]

1 cal = 0.004 BTUs
1 BTU = 250 cal

[KarlInOhio]

Off by 1000. People should be very careful when dealing with calories. There are two types commonly used. One is the physics calorie which is the amount of heat required to raise the temperature of one gram of water 1 degree C. The dietary Calorie is the amount of heat required to raise the temperature of one kilogram of water 1 degree C, or 1000 times larger. This is why European packages often list kilocalories to make it clear which is being used.

One BTU is the heat required to raise one pound of water by one degree F, or about one quarter of a dietary Calorie. (about half the water by about half the temperature change)

Also there are slight changes based on what you use as the base temperature because water does not require exactly the same heat to change by one degree at different temperatures.

[Cboldt]

I don't know calories and BTU, but I know cubic inches and gallon (231), and millimeter to inch (25.4, exact), ft-lb/minute to horsepower (33,000), and probably a few others.

-- The folks at parties might know that one pound of fat equals about 3,500 Calories! --

I like to amaze my friends with the question about which has more energy, a pound of chocolate chip cookies, or a pound of dynamite?